so many oils have a brother company ,it isnt funny,castol isnt even a oil company they are marketers that had someone put their product in castrol bottle and make millions, so look to a oil that works well for what you do,and spend some money and you
will get a oil that is strong not just slick.my oil
of choice ,PLUG-----PURE POWER !and their filter..

 

Castrol only markets oil? I didn't realize that. Check out;
http://www.castrol.com/castrol/secti...tentId=6003211

JMC

 

I use valvoline 5w-20 full synthetic in my truck. Debating on going with royal purple though. Hard to get oil that I use in my area. I have to drive like an 80-100 mile round trip just to get it. I figure if I just order the royal purple I will order enough for a year and be done with it. I do not put all that many miles on my truck (only live 6 block for work) so it would not be all that costly for me. Also they say that you can go 12000 miles between oil changes if your engine has been cleaned out. they recommend doing regular 3000-5000 mile oil changes until your engine is clean of the deposits left by any possible lower quality oil that you use.